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[nm] Add explicit check in ftell()

Ftell() can return -1 if the current position cannot be represented
in a long.

--- a/nm/main.c

+++ b/nm/main.c

@@ -118,7 +118,7 @@

 	while (rdarhdr(fp, &hdr) != EOF) {

 		pos = ftell(fp);

-		if (pos > LONG_MAX - hdr.size) {

+		if (pos == -1 || pos > LONG_MAX - hdr.size) {

 			fprintf(stderr,

 			        "nm: %s: overflow in size of archive\n",

 			        fname);